package com.ruoyi.web.controller.common;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import com.ruoyi.common.config.RuoYiConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import com.google.code.kaptcha.Producer;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.core.redis.RedisCache;
import com.ruoyi.common.utils.sign.Base64;
import com.ruoyi.common.utils.uuid.IdUtils;
import com.ruoyi.system.service.ISysConfigService;

/**
 * 验证码操作处理
 * 
 * @author ruoyi
 */
@RestController
public class CaptchaController
{
    @Resource(name = "captchaProducer")
    private Producer captchaProducer;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    @Autowired
    private RedisCache redisCache;
    
    @Autowired
    private ISysConfigService configService;
    /**
     * 生成验证码
     */
//    使用GET请求映射到“/captchaImage路径的控制器方法，用于获取验证码图片
    @GetMapping("/captchaImage")
    public AjaxResult getCode(HttpServletResponse response) throws IOException
    {
//        创建一个成功的AjaxResult对象
        AjaxResult ajax = AjaxResult.success();
//        查询是否启用验证码功能
        boolean captchaOnOff = configService.selectCaptchaOnOff();
//        在响应中添加"captchaOnOff"字段，表示是否启用验证码
        ajax.put("captchaOnOff", captchaOnOff);

        // 如果未启用验证码功能，直接返回AjaxResult
        if (!captchaOnOff)
        {
            return ajax;
        }

        // 保存验证码信息
        // 生成验证码
        String uuid = IdUtils.simpleUUID(); // 生成一个UUID，通常用于验证码验证
        String verifyKey = Constants.CAPTCHA_CODE_KEY + uuid; // 构建验证码的存储键

        String capStr = null, code = null;
        BufferedImage image = null;

        // 生成验证码
        // 根据配置的验证码类型生成验证码
        String captchaType = RuoYiConfig.getCaptchaType();
        if ("math".equals(captchaType)) {
            // 数学验证码
            String capText = captchaProducerMath.createText();
            capStr = capText.substring(0, capText.lastIndexOf("@"));
            code = capText.substring(capText.lastIndexOf("@") + 1);
            image = captchaProducerMath.createImage(capStr);
        } else if ("char".equals(captchaType)) {
            // 字符验证码
            capStr = code = captchaProducer.createText();
            image = captchaProducer.createImage(capStr);
        }

        // 将验证码存储到Redis缓存，并设置过期时间
        redisCache.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);

        // 将验证码图片转换为Base64编码，以便在前端显示
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try {
            ImageIO.write(image, "jpg", os);
        } catch (IOException e) {
            return AjaxResult.error(e.getMessage());
        }

        // 将UUID、验证码图片的Base64编码存储在AjaxResult中并返回
        ajax.put("uuid", uuid);
        ajax.put("img", Base64.encode(os.toByteArray()));
        return ajax;
    }
}
